Experimental Study of Positionally Disordered Josephson Junctions Arrays

Abstract

We experimentally studied the effect of positional disorder on a Josephson junction array with $f=n$, $1/2+n$, or $2/5+n$ flux quanta per unit cell for integral $n$. This system provides an experimental realization of a two-dimensional XY model with random phase shifts. Contrary to many earlier numerical and analytical investigations, our results suggest that low-temperature superconductivity is never destroyed by positional disorder. As the disorder strength increased, the Kosterltz-Thouless (KT) type order in the $f=0$ and 1/2 systems changed to a non-KT type order with a long-range phase coherence, which persisted even in the maximal disorder limit. A possible finite-temperature glass transition is discussed.

9 pages, 5 figures, RevTex4